WTB [FOUND] Decent audio probe kit or prebuilt

[Kujako]

My jury rigged LM386 amplifier setup has failed me for the last time. Looking for a decent kit or prebuilt audio probe shipped to California USA.

Thanks,

 

[Kujako]

Ordered one of these: https://diy.thcustom.com/shop/signal-tracer-injector-pen-standard/

Designed for guitar pedals, but should work perfectly for other applications. Can ignore the tone generator output and wire it to a 9v battery.